Use Path.home() instead of ~ for determining HOME (#4212)

Author: connorjward

firedrake/configuration.py

@@ -5,7 +5,7 @@
 
 
 def setup_cache_dirs():
-    root = Path(os.environ.get("VIRTUAL_ENV", "~")).joinpath(".cache")
+    root = Path(os.environ.get("VIRTUAL_ENV", Path.home())).joinpath(".cache")
     if "PYOP2_CACHE_DIR" not in os.environ:
         os.environ["PYOP2_CACHE_DIR"] = str(root.joinpath("pyop2"))
     if 'FIREDRAKE_TSFC_KERNEL_CACHE_DIR' not in os.environ: